Diagnosis and remedial measures for corn deficiency and micro-fertilizer

In the process of growth and development, the lack of trace elements in corn will show various symptoms. Identifying corn deficiency and scientific application of micro-fertilizer for remediation is an important technology in corn cultivation.

(1) The young leaves of the zinc-deficient seedlings were light yellow and even white seedlings, the central leaves had obvious green stripes, and the old leaves were gray-brown. At this time, 1.5 kg of zinc sulphate may be applied or sprayed with 0.2%-0.3% zinc sulphate solution, and sprayed continuously for 3 times, each interval of 5-6 days.

(2) The leaves of the old molybdenum-deficient leaves are chlorotic and yellow, and the leaves are curled inward and curled, and the kernels shrink. At this time, foliar spray can be performed with a 0.15%-0.2% molybdic acid solution.

(3) The leaves of the new iron deficiency were chlorotic and yellow, and the veins remained green and showed a stripe shape. The stems and sheaths were purple-red. At this time, the surface was sprayed with 0.2-0.3% ferrous sulfate solution, and sprayed three times.

(4) Young leaves lacking boron can not be opened and whitish, gradually withering and dying, white streaks between the old leaves and veins, and the plants are short and thin. At this time, 85 g of borax or 60-60 g of boric acid can be sprayed with 60 kg of water for foliar spraying, and sprayed 3 times.

(5) The symptoms of Mn deficiency often start from the new leaves, the young leaves turn yellow, there are green spots between the veins, the leaves are soft and the roots are slender and white. At this time, 0.2% manganese sulfate solution can be used for foliar spraying 2-3 times, each interval of 7-10 days.

(6) The copper-deficient plants grow slowly and are short, and the tops form a cluster after they die. The leaves are grayish yellow or red and yellow with white spots, and the ear development is poor. It can be applied to 1 kg of copper sulfate or foliar spray with 0.2% copper sulfate solution.